From cf9dd7008e0695619e067853007a4774d2092dfe Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Sat, 26 Apr 2014 10:24:47 -0700
Subject: [PATCH] rustc: Don't die on 0-length pattern idents
These often crop up when using default methods that don't actually bind their
argument names.
Closes #13775
---
src/librustc/middle/lint.rs | 2 +-
src/test/run-pass/issue-13775.rs | 15 +++++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
create mode 100644 src/test/run-pass/issue-13775.rs
diff --git a/src/librustc/middle/lint.rs b/src/librustc/middle/lint.rs
index 51aafb90ac6..f8c1aaf674c 100644
--- a/src/librustc/middle/lint.rs
+++ b/src/librustc/middle/lint.rs
@@ -1239,7 +1239,7 @@ fn check_pat_uppercase_variable(cx: &Context, p: &ast::Pat) {
// last identifier alone is right choice for this lint.
let ident = path.segments.last().unwrap().identifier;
let s = token::get_ident(ident);
- if s.get().char_at(0).is_uppercase() {
+ if s.get().len() > 0 && s.get().char_at(0).is_uppercase() {
cx.span_lint(
UppercaseVariables,
path.span,
diff --git a/src/test/run-pass/issue-13775.rs b/src/test/run-pass/issue-13775.rs
new file mode 100644
index 00000000000..8731662afa3
--- /dev/null
+++ b/src/test/run-pass/issue-13775.rs
@@ -0,0 +1,15 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+trait Foo {
+ fn bar(&self, int) {}
+}
+
+fn main() {}